gistfile1.aw

/** Set type, based on whether the source starts with http:// or https:// */
				$type = preg_match('|^http(s)?://|', $plugin['source'] ) ? 'web' : 'upload';

				/** Prefix a default path to pre-packaged plugins */
				$source = ( 'upload' == $type ) ? $this->default_path . $plugin['source'] : $plugin['source'];

				$upgrader = new Plugin_Upgrader( new Plugin_Installer_Skin( compact( 'title', 'url', 'nonce', 'plugin', 'api' ) ) ); // Create a new instance of Plugin_Upgrader

				$upgrader->install( $source ); // Perform the action and install the plugin from the $source URL
				
				activate_plugin( $plugin['file_path'] );